Huge Lump Inside Mouth

Yesterday I was eating and something hurt when it shouldn't. I looked inside my mouth and realized that I have a large hard lump in the upper left side of my mouth. It feels like bone growth but it is large enough that when I put my finger in my mouth the gap between the lump and my cheek is very tight and I can barely get my finger through that space.
The other side is normal.
I was hoping it was just a tori but from what I am reading its in the wrong place.
From my understanding, you only get those on the roof of your mouth or in your lower mouth or along both gum lines.
My dentist will be seeing me on Weds but in the meantime, I am so worried about this. Does anyone know what it might be?
Thanks

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